A question about Vsync, need help!

[FrostySharks]

He is a scenario...

I have an AMD fx 8350 stock clock and r9 280x stock clock in a crossfire configuration. Obviously, there will be a bottleneck on the processor, so i need to turn on Vsync because i dont want to overclock and so there wouldn't be a bottleneck on the processor. Lets also say the monitor runs at 60hz.

I heard that if your system cannot output 60fps, it will cut it down to 30fps (half) when running Vsync and so on.

So lets say i play a game and normally i would get 100fps with the crossfire at 50% utilization and the 8350 at 100% utilization. There is obviously a bottleneck and so i turn on Vsync. FPS now matches 60Hz at 60 fps. Now crossfire uses 30% utilization and CPU uses 60% utilization. Then i run into a firefight... here is the question:

Will the crossfire and CPU increases its utilization to try to keep the fps at 60 fps?

Im sorry if this is a stupid question, but im quite new to this Vsync stuff.

p.s. All these percentage are just made up numbers

 

[speud]

Turning on Vsync will limit the FPS to 60 in this case. It will not go higher than 60 but it can go lower if the game is demanding enough. It won't cut it to 30. It's setting the bar at 60 tops. It's mainly used for screen tearing. Framerates higher than what your monitor supports can cause screen tearing so it's a good idea to use vsync to cut that down.

 

[17seconds]

You're overthinking this. Why are you uncomfortable with 100 FPS? For most people, the only reason they would enable VSync is to reduce screen tearing. It will cause input lag as the main drawback, and there's also the potential for your FPS to be cut in half to 30. Are you experiencing intolerable screen tearing?

Using VSync to equalize the load of your CPU vs. GPU is overthinking the situation (in my opinion), and an odd use for VSync. Focus on your user experience, turn off your monitoring software if necessary, and decide if your current experience with Vsync off is enjoyable. If you want to reduce your CPU bottleneck, the best way is to increase your image quality details (higher AA levels) and increase your resolution, thus putting more load on your GPUs.

in answer to your question, if you are running at a straight 60 FPS with VSync on, your GPU/CPU load won't increase when you hit that firefight, since its already being artificially limited in the first place. More load will only limit it less, if I'm making sense. Only with VSync off will you see variations in your load based on varying in-game situations.

 

[FrostySharks]

First off i dont have two r9 280x, i only have one, this is all just an imagination. I am thinking of getting one more r9 280x to run crossfire, but it will DEFINITELY bottleneck my CPU

I get that Vsync will limit my fps to 60fps (in this case) But when im in a firefight, shouldn't the game need more resources from my pc? So the way im thinking is that both the GPU and the CPU will only give the game enough resources to run at 60fps. So lets just say im walking on a field, the CPU and GPU will only give enough resources so i can run 60fps while running on the field. But when im in a firefight the GPU and the CPU will give more resources so that i can run at 60fps when im in a firefight. And lets just say after that im in a SUPER firefight, and that my GPU and CPU cannot really give more of its resources to maintain 60fps, so it decreases to 30fps. Is this correct?

 

[17seconds]

Midway down the page is a good explanation of the 30 FPS problem with regular VSync. Of course, if you had an Nvidia card with Adaptive VSync this wouldn't be an issue.
http://www.hardocp.com/article/2012/04/16/nvidia_adaptive_vsync_technology_review/#.U_FkAJUg-Uk

 

[bystander]

RadeonPro, a 3rd party utility program for AMD cards, has a setting called "Dynamic V-sync". It works like Adaptive V-sync. You set the FPS threshold required for V-sync to be on, and turns it off if the FPS drops lower.

 

[FrostySharks]

Nvdia Adaptive Vsync, that is the sole reason why i ask my question...

Will the crossfire and CPU increases its utilization to try to keep the fps at 60 fps?

I am planning to get "The Division" the upcoming videogame, and i sort of want to crossfire my GPU so i can get more performance, thus better experience with graphic and such. But i really dont want to bottleneck my cpu.

Here are my current specs:
CPU: fx8350 stock speed
GPU: XFX r9 280x stock speed
MOBO: MSI 970 Gaming
HDD: 1TB Seagate
SSD: Corsair 128GB LX

So like i said, i want to add another r9 280x, but i dont want to overclock to get rid of the bottleneck. I was thinking of using Vsync. I dont care if its an odd use of Vsync, what matter is that my CPU wont bottleneck both of my GPU. So here is my question again...

Will the crossfire and CPU increases its utilization to try to keep the fps at 60 fps?

 

[17seconds]

Are you currently gaming above 60 FPS with your single card?

 

[bystander]

Like I said before, download RadeonPro, use Dynamic v-sync and it will behave like Adaptive V-sync.